'use client';

import { Slot } from '@radix-ui/react-slot';
import * as React from 'react';
import { Controller, FormProvider, useFormContext, useFormState } from 'react-hook-form';

import { Label } from '@/components-v2/ui/label';
import { cn } from '@/utils/utils';

import type * as LabelPrimitive from '@radix-ui/react-label';
import type { ControllerProps, FieldPath, FieldValues } from 'react-hook-form';

const Form = FormProvider;

interface FormFieldContextValue<TFieldValues extends FieldValues = FieldValues, TName extends FieldPath<TFieldValues> = FieldPath<TFieldValues>> {
    name: TName;
}

const FormFieldContext = React.createContext<FormFieldContextValue>({} as FormFieldContextValue);

const FormField = <TFieldValues extends FieldValues = FieldValues, TName extends FieldPath<TFieldValues> = FieldPath<TFieldValues>>({
    ...props
}: ControllerProps<TFieldValues, TName>) => {
    return (
        <FormFieldContext.Provider value={{ name: props.name }}>
            <Controller {...props} />
        </FormFieldContext.Provider>
    );
};

const useFormField = () => {
    const fieldContext = React.useContext(FormFieldContext);
    const itemContext = React.useContext(FormItemContext);
    const { getFieldState } = useFormContext();
    const formState = useFormState({ name: fieldContext.name });
    const fieldState = getFieldState(fieldContext.name, formState);

    if (!fieldContext) {
        throw new Error('useFormField should be used within <FormField>');
    }

    const { id } = itemContext;

    return {
        id,
        name: fieldContext.name,
        formItemId: `${id}-form-item`,
        formDescriptionId: `${id}-form-item-description`,
        formMessageId: `${id}-form-item-message`,
        ...fieldState
    };
};

interface FormItemContextValue {
    id: string;
}

const FormItemContext = React.createContext<FormItemContextValue>({} as FormItemContextValue);

function FormItem({ className, ...props }: React.ComponentProps<'div'>) {
    const id = React.useId();

    return (
        <FormItemContext.Provider value={{ id }}>
            <div data-slot="form-item" className={cn('grid gap-2', className)} {...props} />
        </FormItemContext.Provider>
    );
}

function FormLabel({ className, ...props }: React.ComponentProps<typeof LabelPrimitive.Root>) {
    const { error, formItemId } = useFormField();

    return <Label data-slot="form-label" data-error={!!error} className={cn(className)} htmlFor={formItemId} {...props} />;
}

function FormControl({ ...props }: React.ComponentProps<typeof Slot>) {
    const { error, formItemId, formDescriptionId, formMessageId } = useFormField();

    return (
        <Slot
            data-slot="form-control"
            id={formItemId}
            aria-describedby={!error ? formDescriptionId : `${formDescriptionId} ${formMessageId}`}
            aria-invalid={!!error}
            {...props}
        />
    );
}

function FormDescription({ className, ...props }: React.ComponentProps<'p'>) {
    const { formDescriptionId } = useFormField();

    return <p data-slot="form-description" id={formDescriptionId} className={cn('!text-text-tertiary text-body-small-regular', className)} {...props} />;
}

function FormMessage({ className, ...props }: React.ComponentProps<'p'>) {
    const { error, formMessageId } = useFormField();
    const body = error ? String(error?.message ?? '') : props.children;

    if (!body) {
        return null;
    }

    return (
        <p data-slot="form-message" id={formMessageId} className={cn('!text-feedback-error-fg text-body-small-regular', className)} {...props}>
            {body}
        </p>
    );
}

export { Form, FormControl, FormDescription, FormField, FormItem, FormLabel, FormMessage, useFormField };
